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474                             PHILIPPINE   RODENTS                            CHAP.
Sub-Fain. 2. Hydromyinae.—The genus Hydrowiys} of which
there are several species, the best known being H. cfarysogaster,
is an exclusively Australian form, and is aquatic in habit. It
is a foot or so in length, and has a fairly long tail. The fore-
and hind-limbs are webbed, in correspondence with its habits.
The Australian Water-Bat is black, with an admixture of golden-
coloured hairs dorsally and golden colour below, with a lighter
median stripe. The thumb is small, and the webbing of the
hands is not so marked as is that of the feet. The molars are
only two in each half of each jaw. The caecum is rather small,
the measurements of the alimentary canal being : small intestine,
895 mm.; large intestine, 278 mm.; caecum, 7 0 mm. Allied to
the last is Xeromys, a genus which is also Australian, but limited
to Queensland. It has been established by Mr. Thomas,2 who
discovered that it has the same reduced formula as Hydromys.
Xeromys, however, is not an aquatic animal, and has unwebbed
feet.
In the Luzon highlands Mr. Whitehead has discovered, and
Mr. Thomas quite recently described,3 a number of peculiar
Kodents. Of these the genera CJirotortiys> CelaenomySy and Cru-
nomys are allied to the Australian and JSTew Guinea Hydromys.
Ghrotomys whiteheadi is unusual among Muridae, in its
coloration being marked by a pale stripe down the back. The
creature is the size of the Black Eat (Mus rattus). It is terres-
trial not aquatic in habit, in spite of its likeness to Hydromys.
The molars, however, are ^.
Orunomys fallow is more like Hydromys. It has, however,
three molars, as in the last genus. But the skull has the
flattened form characteristic of Hydromys as opposed to Mkts.
lake SottotnySy Celaenomys silaceus is also somewhat inter-
mediate between Hydromys and Mus. It is described as very
Shrew-like in appearance, and has a very pointed muzzle. Its
habits Mr. Whitehead is " quite unable even to guess at." Like
Hydromys and Xeromys this Rodent has but two molars.
Sub-Fam. 3. Bhynchomyinae.—The genus JZJiync'homys, con-
taining but one species, Hh. soricioides (of Thomas), is also, as both
Its generic and specific names imply, a somewhat Shrew-like form in
external aspect. The skull, too, is Insectivore-like in its elonga-
1 For anatomy see Windle, Proc. Zool. Soc, 1887, p. 53.
8 JVoc. Zool. Sloe. 1889, p. 247.             » Trans. Zool. Soc. xir. 1898, p. 377.